How to open FLAC files?
Many different programs support FLAC. The full list is http://flac.sourceforge.net/download.html
Winamp is a skinnable, multi-format media player.
Winamp supports a wide variety of contemporary and specialized music file formats, including MIDI, MOD, MPEG-1 audio layers 1 and 2, AAC, M4A, FLAC, WAV, OGG Vorbis, and Windows Media Audio. It supports gapless playback for MP3 and AAC, and Replay Gain for volume leveling across tracks. In addition, Winamp can play and import music from audio CDs, optionally with CD-Text, and can also burn music to CDs. Winamp supports playback of Windows Media Video and Nullsoft Streaming Video, as well as most of the video formats supported by Windows Media Player. 5.1 Surround sound is supported where formats and decoders allow.
You can extend Winamp's functionality through the use of plug-ins, which are available on the Winamp site.